817890401 has 8 divisors (see below), whose sum is σ = 842248704. Its totient is φ = 793774800.

The previous prime is 817890389. The next prime is 817890407. The reversal of 817890401 is 104098718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 817890401 - 2¹⁰ = 817889377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (817890407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53825 + ... + 67326.

It is an arithmetic number, because the mean of its divisors is an integer number (105281088).

Almost surely, 2^817890401 is an apocalyptic number.

It is an amenable number.

817890401 is a deficient number, since it is larger than the sum of its proper divisors (24358303).

817890401 is a wasteful number, since it uses less digits than its factorization.

817890401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121351.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 817890401 is about 28598.7832083814. The cubic root of 817890401 is about 935.1868047357.

The spelling of 817890401 in words is "eight hundred seventeen million, eight hundred ninety thousand, four hundred one".